EMC E20-007 Online Practice Questions and Exam Preparation

EMC E20-007 Online Questions & Answers

• Question 161:

  Which word or phrase completes the statement? Data-ink ratio is to data visualization as __________ .

  A. Confusion matrix is to classifier
  B. Data scientist is to big data
  C. Seasonality is to ARIMA
  D. K-means is to Naive Bayes
  A. Confusion matrix is to classifier

• Question 162:

  What is required in a presentation for business analysts?

  A. Budgetary considerations and requests
  B. Operational process changes
  C. Detailed statistical explanation of the applicable modeling theory
  D. The presentation author's credentials
  B. Operational process changes

• Question 163:

  Which activity is performed in the Operationalize phase of the Data Analytics Lifecycle?

  A. Define the process to maintain the model
  B. Try different analytical techniques
  C. Try different variables
  D. Transform existing variables
  A. Define the process to maintain the model

• Question 164:

  In data visualization, which type of chart is recommended to represent frequency data?

  A. Line chart
  B. Histogram
  C. Q-Q chart
  D. Scatterplot
  B. Histogram

• Question 165:

  What describes the use of UNION clause in a SQL statement?

  A. Operates on queries and potentially increases the number of rows
  B. Operates on queries and potentially decreases the number of rows
  C. Operates on tables and potentially decreases the number of columns
  D. Operates on both tables and queries and potentially increases both the number of rows and columns
  A. Operates on queries and potentially increases the number of rows

• Question 166:

  Refer to exhibit.

  

  You are asked to write a report on how specific variables impact your client's sales using a data set provided to you by the client. The data includes 15 variables that the client views as directly related to sales, and you are restricted to these variables only.

  After a preliminary analysis of the data, the following findings were made:

  1.

  Multicollinearity is not an issue among the variables

  2.

  Only three variables--A, B, and C--have significant correlation with sales

  You build a linear regression model on the dependent variable of sales with the independent variables of A, B, and C. The results of the regression are seen in the exhibit.

  You cannot request additional datA. what is a way that you could try to increase the R2 of the model without artificially inflating it?

  A. Create clusters based on the data and use them as model inputs
  B. Force all 15 variables into the model as independent variables
  C. Create interaction variables based only on variables A, B, and C
  D. Break variables A, B, and C into their own univariate models
  A. Create clusters based on the data and use them as model inputs

• Question 167:

  Which word or phrase completes the statement? Business Intelligence is to monitoring trends as Data Science is to ________ trends.

  A. Predicting
  B. Discarding
  C. Driving
  D. Optimizing
  A. Predicting

• Question 168:

  Consider the example of an analysis for fraud detection on credit card usage. You will need to ensure higher-risk transactions that may indicate fraudulent credit card activity are retained in your data for analysis, and not dropped as outliers during pre-processing. What will be your approach for loading data into the analytical sandbox for this analysis?

  A. ELT
  B. ETL
  C. EDW
  D. OLTP
  A. ELT

• Question 169:

  Which activity might be performed in the Operationalize phase of the Data Analytics Lifecycle?

  A. Run a pilot
  B. Try different analytical techniques
  C. Try different variables
  D. Transform existing variables
  A. Run a pilot

• Question 170:

  In linear regression, what indicates that an estimated coefficient is significantly different than zero?

  A. A small p-value
  B. R-squared near 1
  C. R-squared near 0
  D. The estimated coefficient is greater than 3
  A. A small p-value